Level-alert sensor



FIG. 1 is a top, front. left side perspective view of the level-alert sensor of the present invention;

FIG. 2 is a top plan view of the level-alert sensor of FIG. 1;

FIG. 3 is a front elevational view of the level-alert sensor of FIG. 1;

FIG. 4 is a top, front, right side perspective view of the level-alert sensor of FIG. 1; and,

FIG. 5 is a top, rear, right side perspective view of the level-alert sensor of FIG. 1. 

The ornamental design for a level-alert sensor, as shown and described. 